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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '888d23d83960bd1f7ad1d9f239471fca35b8f9271d6e548a547af4260f509abc' 
  AND token = '6eG+OLwVrc1aDOeu4n1TjLcdRK2FgH8A2DQcyHhK9oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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