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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87df14a82ef85b1207d96b8569299a8363613bdaff323f6d08f55eab23edeb1f' 
  AND token = 'hTErYDkkskEyO1+lNFo8Lpl3xHyaaOWyvkpZd6N6CcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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