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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74fd127e6fe95b2b927a7c876e503381f970054a2291c0d328b26de5ae74b025' 
  AND token = '1hIh8RV6kKXIesu4ObmKKtVr7ke9q8HerB7XQ/M/Yco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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