SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fff14240d15c52492b57a1c56f47930fb8d9ecb9ef5aa2578c3d7ad92b0b5b8e' 
  AND token = 'bxaSWMjECZQvIaHGA63KlSI+T1XgDdGrCWweEuQ0hrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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