SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '235cdf077bce82ac86c56f14cbc1965867dbfb741885a9fcb19beacc4b155c26' 
  AND token = 'GY++dPjqF3b29Ah6J+QxfvrgCGOwRqjl0hxaIa6PXUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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