SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1a1d696c0a71d3712733a559063807edb75cc125fcf1b755164456a602ce932' 
  AND token = 'cPdiB0RRQHGD1XZ4jmXuj+LUJBKpryecF0Ui4gKozho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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