SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4667f60ef9ebeea4202f8aba6cef231a193656412e61c6c71dded656e1147627' 
  AND token = 'K2jw/5HwnUWQxWFV1lKlYHKIJuTqKhvGQi2cj7L/bR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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