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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3031a42413f88c609d3514f561f369315c56a3dc3ba5c67574d2fed36a361f2c' 
  AND token = 'E7NwCwmUrGEbBhJ6QFo4NCr/ZNJqdQyL16QlHbHVm6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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