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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dff89722c3bff2f95e33c6980d920bc04da238527c89a6d72c0cce4b82337ae7' 
  AND token = 'OjINrXl5/rGBM34aMtqdmeLsrOsk8qmcoWbTy2Sjr/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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