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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b873a2465bee57f9bffc437dfff6ad1eb4ee996ca15843e1f6d2928d226f3f4' 
  AND token = '2Lw71RxYYQki3GG3qYN7v3KiopFf0aiJ/+QAtRQQdWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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