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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c73f4051f10cd3b3b95a9736f654a4b2e6670c41f07693c96f2c03233b026c' 
  AND token = 'Y961u5s0PVTxm8s6lHgeHc63tIu5uGPHIt9Wwd/Bc3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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