SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b38d7e5cf2a56a37260051bfa64193e81d467fe198d6c1ae378a7903a4f0bc82' 
  AND token = 'nIjGTB7Xp1lGHmFumK/WwnX/NW+V9ZT6MkgMvIh8SD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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