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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b16c2f68a9ebbad66a2e46b0d1ff3d6399b03b4951d4bb387e99dc68f5c4008' 
  AND token = 'LIu7nv2piJDSbUvJQxyxtd7fL78P4omT0kc3fzsDydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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