SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e381c2c663684803243aa44ec1ec6ed992619661ce833e1ddab25754ccbe9f' 
  AND token = 'f5q7Y//6vhbDVht/scuTOlyF4aF5R1wXLsEKWYHgLPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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