SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d484622ebcb56502b3c4a4601924a52703e4ae6c260257c4d8d297ebb059b28' 
  AND token = 'uXcBFZqvCfztGDyYTgpSfzQRZyPjRGdWxnBFsOis0A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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