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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ff745cff844ba31d91e0245b8543e335983afadce520bbb947280903afc043' 
  AND token = 'Sh3YvSjVEruNHDmVzYwe0naXNWYipnM1zh1QWnAUYjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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