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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6c67abb20ef6ab3d0fe4b26d70ed1a35725edbb4c7a4953bbde6ca848754d1f' 
  AND token = 'AQkiISMI8ZSdimhhO1TPzOiOtI9kW3hO1XVPCZ8CXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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