SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dec60412db8483bae29eb1bc59f957dfde7ad99281ea68fa404f9873bf1d653' 
  AND token = 'j03p2QGiSkER4XCAMSKZY/Q3gAIU1zX8aOdXfJdLBSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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