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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f25842e13d59e9fa8bb381b81a3f99cb56e74c2368fe8b7e377f8be6f6ac102' 
  AND token = '8SZcKHohinclQ9fvFGBvT9QWov60ZbU6VE1NnR8NuJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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