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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '399cbfd8882231750ccef5146a8b4f35d6cb16aefe940c9d03f160cdf1fd93d8' 
  AND token = 'WNmk8rRivm5cR94Hwgkjc3NFWwK6617pUA9TeL0Qoyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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