SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7562ddc663f4ec919f82b565b048cbba485dcc5b41f6a3a56a9b6e0f97dd36c9' 
  AND token = 'kOSrmor0UQbZ23YHKATGwxNGzKqNWVOBBCu3VO4uNIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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