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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '336cf40784cdfb0dbf72f44a1ce884b75f4c6baef2f2edeae66d8a090db07d86' 
  AND token = 'PfMaW9W6ip1hDo+p/5ZBtHXR4/ZhazqUl8t7CS3S5+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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