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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '802cd81f65311fd05da8f1fa884bec8dc65397a4554b87575d0b865bfb01b689' 
  AND token = 'a3EA5ELY8D8xD4DQSWkTJDV3CxAvEj7DhOQkCkXRHjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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