SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e25cbfa32e621afec5664c747cc07be9bee97c59c87a2312ff6082f0e911f1b' 
  AND token = 'gcL0J0hJebFFyAIRNzXHICqhG94ZyYkVwGNcAj45jV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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