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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0907cfe99e2b249163b8c8fe6bc760baba4284421c6cf75518d5c1b638ea0f21' 
  AND token = '08DwaRd1HJgjKh8Zx8CM0MFn5KLtExpacfVAGD9VkgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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