SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a93999861da23db4e62b422745a7569070fd070768d543e6d940edfdad95d07' 
  AND token = 'vdO+XB/QJy/HqzShwqaWKl5pLCrV4W7HYebNEcRG0Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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