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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '800e566214d2fb9c0024f34d1be7bebe6a32a931dce9c243067b818ed02aa0e4' 
  AND token = 'N8E7yXcUcPodYNWq3T63JxHY43h1yJXiHf5wWmhsWrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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