SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '609ceb50c6075709b807fcc6382bac7e6db43e2291dc435d80a723321e61aa54' 
  AND token = 'PP9nQr4y3ugiGD2SL+xyYYc0dxEmHz/fxh+GrQxunBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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