SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aad8820db04048ede9c05f6c74c91392744c32bb43a5d72ec96b9af382703b28' 
  AND token = 'ZZp08ZceksuH1j9H/FjQPqVqGG5I+9XWkt/t02vqK+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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