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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1aeceb87c458554b6d9db5002547a0a2378b97a07bc504b1ec2e26b21c1924bf' 
  AND token = 'pdDrTXMyTlGsd468ci9q9S0wKwnK8bRQMeYnI3+DA20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}