SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd609e2a60816dda161c8cc48ce2599064b26fbde9275e35377cb1c2d8af5e26' 
  AND token = 'az7GGvav4LGIZ/0wsX+gf0hKhj8WGJIz8a8+5IxTUjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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