SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbea893de17d8c8789461f72a9f8b0cf13c7a752a867f003c3441b520498ca9a' 
  AND token = 'qYo+levh0OR6I0GeDsAmS+mfpjpUkCrwbuiCEZhl75s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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