SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72a33a1d6a14507d6411b805752268a41f0c9f5d79d968df6589eb0d03199269' 
  AND token = 'UfFVg/2dGQq2V6jlR61crnvFwMVAF/l3GJilSmIOqwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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