SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32bb66311402c439e8b041f5a3e61597363a850d7bcf793db9ad00b0deb506be' 
  AND token = 'bDVJPuVCQ4ULQ/MTjGzCDTfEZ6rBLoQhLtUnLV1g+yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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