SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76b0aba9aaee773d2135ff29b8788d26f55d3b5f404838294f8184ab6c96d40f' 
  AND token = 'xiohqwTWT88KYZfWU+IoBdgQBiG3y4HpjyEn6FeyAd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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