SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c76f26a02574c6c80dd630d3b8c4da803b0419b04372f4dcea27b17c0988c59' 
  AND token = '9sukPYr+Ju7aWlb23RGyZiCn2zw58nTbvqKeyDZEvWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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