SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da4ebc2f224832943ef2855182aabe00f9ac82428721e8f17c6c840cb92fca13' 
  AND token = 'vpohXprRi+4VwtYmlhJIHXsaP7v/77901VMiWGZujjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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