SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b8080f433ca1f6063c6e825d25474f9d9b1863db3ac5def013d4846f5917bd' 
  AND token = 'fV35KBqOelUYErfJgNfZOqlMWh9n/Uq+yJ149ck171U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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