SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7338dfe808bdf5e9c38c4a7dee5f7c42bcba0654fd68bef006812d481c8a81b' 
  AND token = 'pOl9zozXgnnRJY60GOKEuIzsSqQWQTCJTOnXUjNQGE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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