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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b8f711e48f9bb5be51aef6b8ebc8d6e38afb639c3bd13c3a9879a7bfeaa4166' 
  AND token = 'HkvbqR+hHvAW0a/0TRrKqWmQpT6Ppbhmwg162HPICXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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