SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e43a2f8017344ba626117b2dd735833203c1eb1db55f3db78f6b0c33e08c8b66' 
  AND token = 'NypFc9YOUuBhjcwtobZKlhKsKDuqHBUgvcHYJzDtL9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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