SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e06b4aa7010714a2db273096926b5c7556d1e18751df6c279d64bd3fa8c38835' 
  AND token = 'Fn9tTygh+zrPndscZHgR6y+KUplmhci8Laqjzj5AN6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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