SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eacd58274669af1dd75da90dd905a0b2e27a50cf3f6de768a4e015ae7f0fc62' 
  AND token = 'SZwXVHbnDJChsIF4xsnC9fSMjEyyGwFH2OoWrzhvWZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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