SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e62deda4233d9137005884dfb14711564bd71db95cdb21c25750e4a94d9e510' 
  AND token = 'FcK6k2H4cy6pzIYnDwi1ZVJX/bKjQ5eveiVh0Xbq1Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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