SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feff2389322d17c2c07b7e8628c5e022b32347388a422f8bbd1728b855de69df' 
  AND token = 'b8l/XMS8AagpIMpupKQXPNxcJuL3F+r57JQfqZBsNjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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