Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51114f1a0951068aba5dc6544f66415d101e3f4874f35499be89b16a550956cf' 
  AND token = 'p1VaMwxtPWd9IJuA6LUhZ+Nfeedd5+UoxXnqYvPG+8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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