SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9657918596b39d57ac75378ac09e8c2df4f54330c321ab1d0e164deb1e78a746' 
  AND token = 'f3yBF9ZUoViHTLEF6mD65Kg4ciCuJcAd/5MvhklR+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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