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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f042ae7ddb7527eb84433ac9820b5ede9599c992761e57b6a34b9981479ad089' 
  AND token = 'kRt7aU+JR4usQIee9DDDfTnac4yFd4z6uOYp/vE1Inc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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