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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a79ad33d6bf4107ff0d643bf1d13f1766fb0566f3ec1bb0199b556d438b6accd' 
  AND token = 'qUduNyEc/+VezMS9GyLROLxyV30KAGZ2o2qjS0EaO1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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