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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9791f03379f1274a8451573283a2f937b678baeb77dde4976a08d66e9e94708' 
  AND token = 'we7XNM3YuEFwPxOQtZxNLEtfS1AcrDHeP7T1oMFmVrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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