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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '182d3c4ead490dfae2d08e8b7dbbf32a16754f71781df945e3f0cb559409b5d5' 
  AND token = 'GkexhqpKTffB5P0HaQrZPI93t2Lipq7OMMo39Jozxw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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