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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e14ed26df56d07b4fa62b66497376eb7a9409ff0a7db983269015ced4c7118' 
  AND token = 'haSigkD5C5f1r5Nfh2vBisVdvOy6uVinDgnPie9izX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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