SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '257cc3e5216ea1039030f4d29aa9630578e9676c01d543ff6fbe0a083d349e4e' 
  AND token = 'qVlo5UJqC70rU1XwiPWB1oIAu+i28woKZVd3ZT9flUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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