Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d7bf7682e23b74fc30d77bb01ebeeb563a9aa6b6b5638bb48340a3b756a49c' 
  AND token = 'bm/v5QxDisSVaBMxwAbKUtkPewqsusAPlvY3i6GeVl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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