SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94b4381fcd11368c0cb743ae09725c1d21ee7d5729f0b024a0e6eead4a33686c' 
  AND token = 'mpu9LsD1hVgMQLAz0YoEErTNw7BDwqRYU51+kNkQj00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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