SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49bfc724903c7341c71e8dde059ba789b78acb17a22efebdc47586475fd46c43' 
  AND token = 'l1Xwo5U42mhhGYKNZQmPpm0Y/E0YmodRGygAQ+GdM9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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