SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51895f54144c38085e9b9547cc92d7642ff0a63aa7f3db297a868487ae4f0753' 
  AND token = 'dLCyQXEu7X+UrDbZMRDDwKncw3q7aA9lh9omK1GcFkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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