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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e42fb7e0297fe7386291ba9fbdcef1adb84dc5c4f79110b8abd16ab75f3c0b6e' 
  AND token = 'JTjMJ7BosA9DskH+Z0+0leFS/kuAU8PAbBKOUyK+/40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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