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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a8710b0db487440cbc249c3166974823818e9ab6ad1e596db46cef2bd2197d' 
  AND token = 'lMnYLlDUhMfOWbXI/e2Zhx5K+w0blUnudFB7XeJ9U4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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