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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97bd34368c5a19e70b3ec5350e73c1c84361925c7492d99b69561c1f4f2b4d56' 
  AND token = 'sWydYzpbM1ANQSTyuO0D5LrLeMHLeqMKynzH3tq/eCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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