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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a19877a72002323135aace918981939a288bea53005cb9394ea0c69f21732719' 
  AND token = '+HTEu/JJna/eF6QPsI3HUiisIlzkXQHH4O4hTQn9eS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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