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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f74de7646e624eb69688206842ee2fbe400e147cb48377afee55fe5c2d848e11' 
  AND token = '4tNXOnerRVDoi/0P0eib5TSht9VL0ScghbD/qc2UXA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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