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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e488668a4fa3e38c6bae69b070da5e6b8c070d645a3ec84635dbd0545a56cf9' 
  AND token = '4CuEctLESeA8a+kcGRXdJr82eP7LpeN8gbIc2AahD3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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