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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c215d82b4426e5ea3d9915142b6d31acdcaedfedc31259f92864d19e8a90f8d' 
  AND token = 'zxccZtwYEPk0c7XXwl935B7YGpZvqd60+/90OTsxRaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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